Explanation/Reference:
Explanation:
Set max degree of parallelism (MAXDOP) to 1 for instances of SQL Server that host SharePoint databases to make sure that a single SQL Server process serves each request.
Important:
Setting the max degree of parallelism to any other number can cause a less optimal query plan to be used that will decrease SharePoint Server 2013 performance.
References: http://technet.microsoft.com/en-us/library/hh292622(v=office.15).aspx